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Pregnancy Calculator
健康Estimate due date based on LMP, conception, or IVF transfer.
ttb run pregnancy-calculator
选择日期进行计算
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如何使用 Pregnancy Calculator
Enter the first day of your last menstrual period (LMP) or your estimated conception date. The calculator determines your estimated due date, current week of pregnancy, trimester, and key milestone dates. All medical calculations use the standard Naegele's rule (adding 280 days to LMP).
1
Enter your parameters
Configure the inputs for the Pregnancy Calculator according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
常见问题
How accurate is the due date?+
Only about 4% of babies are born on their actual due date. The due date is an estimate - most births occur within a two-week window around it (between 38 and 42 weeks). Your doctor may adjust the date based on ultrasound measurements.
What is Naegele's rule?+
Naegele's rule estimates the due date by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP). It assumes a 28-day cycle with ovulation on day 14. For longer or shorter cycles, the estimate may need adjustment.